Answer: Option A, mother-daughter, is the most common dyad in shared psychotic disorder.
Step-by-step explanation:
The most common dyad in shared psychotic disorder is mother-daughter. The shared psychotic disorder is also called folie a deux. It is a rare mental illness in which a person develops delusions, or false beliefs, that are similar to those of a person with whom they share a close relationship, such as a family member or partner. The person who initiates the delusion is called the primary case, while the other person is known as the secondary case.
Hence, the answer is A